Results (looking at air/water temps only) seem to be indicating a ~37% performance improvement with the PA over the HE at the fan power provided. That's even better than the results I was seeing with the old coarse prototype I had here. Should be even bigger gains on tap if you ran the fans at 5v and did a comparison there. Looks like the final production version has come on song very nicely indeed.
Results are rather wild though, and swinging by quite large amounts, so hard to be really confident about what's being reported, but there can be no doubt that the PA is kicking the HE's butt by significantly more than any apparant margin of error.